Mechanism in machines fob eollina soeew threads



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11. AQHARVEY; FEEDING MECHANISM IN MACHINES FOR ROLLING SCREW THREADS.

No. 248,163. Patented Oct. 11,1881.

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H. A. HARVEY. FEEDING MECHANISM INMA'GHINES FOR ROLLING SCREW THREADS.

No. 248,163. Patelited 001;. 11,1881.

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H. A. HARVEY.

FEEDING MECHANISM IN MACHINES FOR ROLLING SOREW THREADS.

No. 248,163; Patented 001;. 11,1881.

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UNITE STATES PATENT OFFICE.

HAYWARD A. HARVEY, 'oE ORANGE, NEW JERsEY.

FEEDINGMECHANISM IN- MACHINES FOR ROLLING SCREW-THREADS.

SPECIFICATION forming part of Letters Patent No. 248,163, dated. October 11, 1881.

Application filed May 18,1881. (No model.) 7

To all whom it may concern Be it known that I, HAYWARD A. HARVEY,

of Orange, New Jersey, have invented certain Improvements in Feeding Mechanism in Maformed with systems of parallel ribs inclined respectively in opposite directions; and my invention consists in the employment of an intermittently rotatingfeed-whee-l having notches in its periphery into which screw-blanks are deposited from any required number of guide channels or ways extending from a hopper or hoppers to the edge of the feed-wheel, the distances between the discharge ends of the ways being the same as the distances between Thus when the feed-wheel is stationary some one of its notches stands opposite the discharge end of each of the ways, and, if empty, may receive a blank discharged from the ways, or, if it fails to receive a blank from one pair of ways will have other opportunities of being supplied as it isbrought by the step-by-step rotation of the feed-wheel successively opposite the discharge ends of the other ways. The blanks are heldin the notches by a curved guard extending around the edge of the feed-wheel to the place where the blanks are successively pushed outward from the notches against the working-face of one of the dies, which, being in motion, rolls the blank 01f the face of the pusher into-the space between the two dies. By suitably increasing the number of guide channels or ways the granted to me January 20, 1880.

In this machine a suitable frame, A, affords the bearings for the vertical shaft B of the rotating cylindrical die 0, which, in conjunction with thestationary curved die D, performs the preliminary operation of impressing aspiral groove upon the body of the screw-blank.

The mechanism for feeding the blanks to the action of the dies consists otfthe horizontal feed-wheel E, having the equidistant notches 6 formed in its edge. Screw-blanks deposited in these notches from the lower ends, f, of the inclined guide channels or so-called ways F are prevented from slipping out by the curved guard E until they successively arrive at a point adjacent to the end D of the stationary die D. The blank having arrived at this point is held in its notch by the movable spring-guard e, which is. afiixed to the end of the'curved guard E.

The inclined waysF are supplied with blanks from a hopper or hoppers of ordinary construction.' The blanks, hanging by their heads in these ways, slide down by their own gravity and slip from the endsot' the ways into the notches e in the feed-wheel.

The delivery of the blanks successively from the notches e to the dies is effected by the pusher G upon the upper end of the rocking lever g, the lower end of which is kept against the face of the rotating cam ,G by the spiral spring The cam G has the projections G formed upon its periphery, and means of adjustment G are provided for accurately seating the cam G upon the shaft B in proper relation with the die 0, so that when the projections G strike against and push out the lower end of the le ver g, and the pusher G consequently pushes a blank out of one of the notches 0 against the face of the rotating die, and the rotating die rolls such blank into the space between. the two dies, the ribs upon the stationary die, at their points of first engagement with the blank. will occupy elevations midway between the elevations occupied by the ribs of the rotating die at the same time in engagement with the opposite side of the blank.

The movable guard 0 yields as the pusher Gr pushes the blank out of its notch against the face of the rotating die, and after the blank has been engaged by the rotating die and rolled away from the face of the pusher, the guard c springs back into position to perform its function for the blank in the next succeeding notch.

The circumference ot'the rotating die is made substantially a multiple of the circumterence of the shank of the screw-blank which is intended to be operated upon, and what may be called the feeding-points upon the rotating die equal in number the number of times which the circumference of the blank is contained in the circumference of the die.

The projections G upon the cam G equal in number the feeding-points upon the die, and as these projections are equidistant it follows that an adjustment of the cam with relation to the die which properly times the feeding of a blank to one of the feeding-points, likewise properly times the feeding of blanks to all the feeding-points successively.

The feed-wheel is intermittently rotated by means of the pawl E projecting backward from the upper end of the lever g and engaging the teeth upon the cog-wheel E The range of backward movement of the pusher-lever and its pawl, and the diameter of the cog-wheel E are calculated with reference to giving suflicient rotation to the feed'wheel to bring the notches c successively over the spacein front of the pusher; and to insure the bringing of the feed-wheel to rest at the proper point a detent or projection, E, is also affixed to and projects backward from the pusher G in position to enter one of the spaces between the teeth of the cogwheel E, and stop its further rotation when the actuating-pawl E has completed its backward movement.

Any reverse rotary movement of the feedwheel F is prevented by the stationary spring detent-pawl E Whenever the feed-wheel E is stationary one of the notches e is held immediately opposite the discharge end f of each of the ways F, and,

if empty, may receive a blank therefrom. If for any reason an empty notch passes the end of one pairof ways, it may receive a blank from the discharge end of one of the other pairs of ways, in front of all of which it will be successively brought to rest during the operation of delivering the blanks from the notches in the feed-wheel to the dies.

It will be seen that by this organization of the feeding mechanism a very small range of movement suftiees to effect the delivery of a blank from the feed-wheel to the dies and a very slight movement of the feed-wheel suffices to bring another blank into position to be delivered, and hence the feeding operation can be performed with a degree of rapidity commensurate with the requirements of the class of screwthreading machines in which the thread is formed by rolling the blank between two dies.

I claim as my invention- 1. In a machine for forming screw-threads by rolling blanks between the faces of two dies having systems of parallel ribs inclined respectively in opposite directions, an intermittently-rotating feed-wheel provided 'with notches in its periphery, in combination with a pusher for pushing the blanks successively out of the notches when the feed-wheel is at rest against the face of the moving die, substantially as described.

2. An intermittently-rotating feed-wheel provided with notches in its periphery, and two or more pairs of ways for conducting blanks from a hopper or hoppers into the notches of the feed-wheel, which are successively brought to rest opposite the discharge end of such ways,in combination with a curved guard for holding the blanks in the notches during the rotation of the wheel while carrying the blanks from the points where they are deposited in the notches to the point where they are successively delivered from the notches against the face of themoving die, substantially as set forth.

3. The feed-wheel E, provided with the notches c in its periphery, and the toothed wheelE, affixed to the shaft of the feed-wheel, in combination with the pawl E the detent E the rocking lever g, and the cam G, substantially as and for the purpose set forth.

H. A. HARVEY.

Witnesses:

M. L. ADAMS, R. W. ARMSTRONG. 

